package com.eastidea.live.util;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Hashtable;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang3.StringUtils;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;


public class QrUtil {
	
	private static final int BLACK = 0xFF000000; //二维码图形的颜色  
    private static final int WHITE = 0xFFFFFFFF; //背景色  
	
//	QrUtil.genQr("http://192.168.1.228:8080/m/index.html?aid=174", RequestUtil.getWebRoot(request) +  "upload/qr/" +  
//			formId.toString());

	public static String genQr(String content, String path) {
		String fullPath = path + ".jpg";
		try {
		     MultiFormatWriter multiFormatWriter = new MultiFormatWriter();		     
		     Hashtable hints = new Hashtable();
		     hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
		     BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 400, 400,hints);
		     File file = new File(path);
		     writeToFile(bitMatrix, "jpg", file);
		 } catch (Exception e) {
		     e.printStackTrace();
		 }
		return fullPath;
	}
	
	public static BufferedImage toBufferedImage(BitMatrix matrix){  
        int width = matrix.getWidth();  
        int height = matrix.getHeight();  
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);   
        for (int x = 0; x < width; x++) {   
            for (int y = 0; y < height; y++) {   
                image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);   
            }  
        }  
        return image;  
    }
	
	public static void writeToFile(BitMatrix matrix, String format, File file)throws IOException {   
        BufferedImage image = toBufferedImage(matrix);   
        if (!ImageIO.write(image, format, file)) {   
            throw new IOException("Could not write an image of format " + format + " to " + file);   
        }   
    }
}
